Codebook Optimization for the Superposition Transmission of Uplink SCMA Systems

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For an uplink sparse code multiple access (SCMA) system, a codehook-domain superposition transmission can be applied to increase the multiplexing gain by efficient utilization of the codebooks as multiple access resources. However, the destructive collision of superposed codewords can restrict the performance improvement of the system because of the increasing interlayer interferences. In this paper, we analyze the effects of the interlayer interferences on the bit error rates, and optimize the SCMA codebooks that can mitigate the interlayer interferences. Simulation results show that the optimized codebooks can provide a noticeable gain to improve the performance of uplink SCMA systems applied with superposition transmission.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-10
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.67, no.10, pp.10112 - 10117

ISSN
0018-9545
DOI
10.1109/TVT.2018.2862355
URI
http://hdl.handle.net/10203/246523
Appears in Collection
EE-Journal Papers(저널논문)
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